Texas Bull Nettle (Cnidoscolus texanus) - How to Grow & Care Guide

Plant Snapshot

Common Name: Texas Bull Nettle
Latin Name: Cnidoscolus texanus
Hardiness Zones: USDA zones about 7–10; colder sites below zone 7 may see dieback or winter kill while warmer zones favor longer growing season and more vigorous reseeding
Typical Height: 1–3 ft (30–90 cm)
Typical Spread: 1–2 ft (30–60 cm) clumping to loose colonies from seed
Bloom Period: Spring through early fall depending on climate, often peaking in spring and summer
Soil Preferences: Dry to moderately dry, well drained sandy or rocky soils. Tolerates low fertility. Poor performance in consistently wet or poorly drained soils which can cause decline
Light Preferences: Full sun to light shade. Best flowering and form in full sun
Toxicity: Stinging hairs on leaves and stems cause painful skin irritation on contact. Not a common edible plant and ingestion may cause gastrointestinal upset. Use gloves and keep pets and children away from plants
Propagation: Propagation by seed and by regrowth from the root crown. Sow seed in seasonally appropriate windows and avoid handling plants without protection

Key Facts

Native perennial herb found in Texas and neighboring states
Produces showy white flowers often with a darker center
Stems and leaves bear stinging hairs that cause painful skin irritation
Prefers dry, well drained sandy or rocky soils
Attracts bees and other pollinators when in flower
Spreads by seed and by resprouting from the root crown

Texas Bull Nettle is a native perennial with showy white flowers and stems and leaves covered in stinging hairs that cause painful skin irritation. It works well in dry, sunny native plantings and pollinator patches but should be kept away from paths and play areas because of its sting.

Identification and size

Plants reach about 1 to 3 feet tall in typical conditions and produce white flowers often with a darker center. Leaves and stems bear stiff hairs that sting on contact, which is the easiest field clue to tell this plant apart from other white wildflowers.

Best uses and where to grow

Use Texas Bull Nettle in dry, well drained sandy or rocky soils where drought tolerance and low fertility are advantages. It attracts bees and other pollinators when in flower, so it fits native meadows, roadside mixes, and sunny slopes. Avoid planting where children, pets, or foot traffic will contact the plants.

Planting and seasonal care

Sow seed or transplant small plants in seasonally appropriate windows for your region, and protect hands with gloves when handling. Plant in full sun to light shade for best flowering, and give it a dry to moderately dry site. Consistently wet or poorly drained soils cause decline and poor performance.

Watering and visible responses

Once established the plant tolerates drought and shows its best form in lean, well drained soils. Extra water and rich soils can make plants look lanky and increase reseeding, while poor drainage often leads to decline or winter dieback in cooler sites.

After flowering and maintenance

Remove seed heads if you want to limit naturalizing, and cut plants back to near the root crown to reduce resprouting. If plants are unwanted dig out the root crown because it can resprout from that structure. Always use gloves and eye protection when pruning to avoid contact with stinging hairs.

Safety and toxicity

Stinging hairs on leaves and stems cause painful dermatitis on contact. The species is not a common edible plant and ingestion may cause gastrointestinal upset. Keep plants away from children and pets and consult local poison control or a veterinarian if ingestion occurs.

Frequently asked questions

How fast does Texas Bull Nettle grow?: Growth rate varies with site, but plants commonly reach the typical mature height of 1 to 3 feet in a single growing season under favorable conditions and will resprout from the root crown the following year.
When does Texas Bull Nettle bloom?: Bloom season runs from spring through early fall depending on climate, with longer flowering in warmer locations.
Can Texas Bull Nettle spread or naturalize?: Yes. The plant spreads by seed and by resprouting from the root crown. Remove seed heads and dig the crown to limit spread.
Where is this species hardy?: It is adapted to roughly USDA zones 7 to 10, with colder sites below zone 7 at risk of dieback or winter kill.
How do I remove a patch safely?: Wear thick gloves and eye protection, cut plants down before they set seed, then dig out the root crowns to prevent resprouting.